body { font-family: Arial; padding:20px; }

button { padding:10px; margin-top:10px; }

#version {
  font-size:12px;
  margin-bottom:10px;
  opacity:0.6;
}

@keyframes pop {
  0%{transform:scale(1);}
  50%{transform:scale(1.2);}
  100%{transform:scale(1);}
}

.pop { animation: pop 0.3s; }

@keyframes shake {
  0%{transform:translateX(0);}
  25%{transform:translateX(-5px);}
  75%{transform:translateX(5px);}
  100%{transform:translateX(0);}
}

.shake { animation: shake 0.3s; }